Question

Resolva as equações

× - y = 3
2x - 2y = 2

m + 2n = 2
m + n = 3

a - 2b = -5
4b - 2a = 10

3x + 4y = 2
x + 2y = 2

5x - y = 1
2x + 4y = -4

x - 2y = -1
3x - 6y = -3

2× - 6y = 0
3x - 9y = 0

Answer 1

x=3+y
2(3+y)-2y=2
6+2y-2y=2
0y=-4
y=0
x=3

m=3-n
3-n+2n=2
n=-1
m=3+1
m=4

a=-5+2b
4b-2(-5+2b)=10
4b+10-4b=10
b=0
a=-5

x=2-2y
3(2-2y)+4y=2
6-6y+4y=2
-2y=-4(-1)
y=2
x=2-2*2
x=2-4
x=-2

-y=1-5x
2x+4(1-5x)=-4
2x+4-20x=-4
-18x=-8(-1)
x=0,4
-y=1-5(0,4)
-y=1-2
-y=-1(-1)
y=1

x=-1+2y
3(-1+2y)-6y=-3
-3+6y-6y=-3
y=0
x=-1

2x=6y
x=3y
3(3y)-9y=0
9y-9y=0
y=0
x=0